|
|
|
3. Carex subsect. Caespitosae Fries ex Kükenthal in Engler, Pflanzenr. 38(IV. 20): 324. 1909.
丛薹草亚组 cong tai cao ya zu
Rhizome short or stoloniferous. Culms slender, acutely trigonous, clothed at base with bladeless sheaths. Leaves flat or plicate, margins revolute. Involucral bracts leaflike or setaceous. Spikes upper 1-3 male; remaining spikes female, cylindric or oblong, densely many flowered, sessile or lower ones with short peduncles, erect. Female glumes brown or blackish, 3-veined, apex obtuse or acute. Utricles ovate or elliptic, plano-convex or biconvex, membranous, veined or nerveless except for 2 marginal veins.
About 16 species: Asia, North America; 11 species (four endemic) in China.
|
|
|
|
| 1 |
Utricles scabrous on upper margins. |
|
404 C. forrestii |
| + |
Utricles smooth on margins |
|
(2) |
| |
|
|
|
| 2 (1) |
Lower involucral bracts setaceous |
|
(3) |
| + |
Lower involucral bracts leaflike |
|
(5) |
| |
|
|
|
| 3 (2) |
Utricles obovate or suborbicular. |
|
412 C. schmidtii |
| + |
Utricles ovate or elliptic |
|
(4) |
| |
|
|
|
| 4 (3) |
Female spikes oblong or cylindric, to 25 mm, with short peduncles; utricles with short beak. |
|
413 C. caespitosa |
| + |
Female spikes broadly ovate, ca. 7 mm, sessile; utricles ± beakless. |
|
414 C. maquensis |
| |
|
|
|
| 5 (2) |
Utricles veined |
|
(6) |
| + |
Utricles nerveless or faintly few veined |
|
(7) |
| |
|
|
|
| 6 (5) |
Rhizome without stolons; female glumes narrowly elliptic, 1.5-2 mm. |
|
405 C. appendiculata |
| + |
Rhizome with long stolons; female glumes oblong, 2.5-2.8 mm. |
|
406 C. thunbergii |
| |
|
|
|
| 7 (5) |
Utricles shorter than glume. |
|
407 C. aperta |
| + |
Utricles longer than glume |
|
(8) |
| |
|
|
|
| 8 (7) |
Rhizome without stolons; spikes disposed in fastigiate inflorescence; utricles oblong-fusiform. |
|
408 C. prolongata |
| + |
Rhizome stoloniferous; spikes disposed in racemose inflorescence |
|
(9) |
| |
|
|
|
| 9 (8) |
Utricles ovate, with obscure beak, orifice entire. |
|
409 C. cinerascens |
| + |
Utricles elliptic or obovate, with very short beak, orifice emarginate or entire |
|
(10) |
| |
|
|
|
| 10 (9) |
Female spikes narrowly oblong, 15-40 × 2-3 mm. |
|
410 C. micrantha |
| + |
Female spikes cylindric, 12-20 × 6-7 mm. |
|
411 C. caespititia |
|
|
|
| Related Links (opens in a new window) |
|
Other Databases
|
|
|
|
|
|
|
|
|
